參數(shù)資料
型號(hào): PSD4235G2-90UT
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 256K X 16 FLASH, 52 I/O, PIA-GENERAL PURPOSE, PQFP80
封裝: PLASTIC, TQFP-80
文件頁數(shù): 31/100頁
文件大小: 933K
代理商: PSD4235G2-90UT
PSD4235G2
36/100
Separate Space Modes
Program space is separated from Data space. For
example, Program Select Enable (PSEN, CNTL2)
is used to access the program code from the pri-
mary Flash memory, while Read Strobe (RD,
CNTL1) is used to access data from the secondary
Flash memory, SRAM and I/O Port blocks. This
configuration requires the VM register to be set to
0Ch (see Figure 9).
Combined Space Modes
The Program and Data spaces are combined into
one memory space that allows the primary Flash
memory, secondary Flash memory, and SRAM to
be accessed by either Program Select Enable
(PSEN, CNTL2) or Read Strobe (RD, CNTL1). For
example, to configure the primary Flash memory
in Combined space, Bits 2 and 4 of the VM register
are set to ’1’ (see Figure 10).
80C51XA Memory Map Example
See the Application Notes for examples.
Figure 9. 8031 Memory Modules - Separate Space
Figure 10. 8031 Memory Modules - Combined Space
Primary
Flash
Memory
DPLD
Secondary
Flash
Memory
SRAM
RS0
CSBOOT0-3
FS0-FS7
CS
OE
RD
PSEN
OE
AI02869C
Primary
Flash
Memory
DPLD
Secondary
Flash
Memory
SRAM
RS0
CSBOOT0-3
FS0-FS7
RD
CS
RD
OE
VM REG BIT 2
PSEN
VM REG BIT 0
VM REG BIT 1
VM REG BIT 3
VM REG BIT 4
OE
AI02870C
相關(guān)PDF資料
PDF描述
PSD4256G6V-10UIT 1M X 8 FLASH, 52 I/O, PIA-GENERAL PURPOSE, PQFP80
PSD6407 POSITION SENSITIVE DETECTOR
PSD813F2-15JT 128K X 8 FLASH, 27 I/O, PIA-GENERAL PURPOSE, PQCC52
PSD813F5V-20MT 128K X 8 FLASH, 27 I/O, PIA-GENERAL PURPOSE, PQFP52
PSD853F2-15JIT 128K X 8 FLASH, 27 I/O, PIA-GENERAL PURPOSE, PQCC52
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PSD4235G2V-12UI 功能描述:CPLD - 復(fù)雜可編程邏輯器件 3.3V 4M 120ns RoHS:否 制造商:Lattice 系列: 存儲(chǔ)類型:EEPROM 大電池?cái)?shù)量:128 最大工作頻率:333 MHz 延遲時(shí)間:2.7 ns 可編程輸入/輸出端數(shù)量:64 工作電源電壓:3.3 V 最大工作溫度:+ 90 C 最小工作溫度:0 C 封裝 / 箱體:TQFP-100
PSD4235G2V-90U 功能描述:CPLD - 復(fù)雜可編程邏輯器件 3.3V 4M 90ns RoHS:否 制造商:Lattice 系列: 存儲(chǔ)類型:EEPROM 大電池?cái)?shù)量:128 最大工作頻率:333 MHz 延遲時(shí)間:2.7 ns 可編程輸入/輸出端數(shù)量:64 工作電源電壓:3.3 V 最大工作溫度:+ 90 C 最小工作溫度:0 C 封裝 / 箱體:TQFP-100
PSD4256G6V-10UI 功能描述:CPLD - 復(fù)雜可編程邏輯器件 3.3V 8M 100ns RoHS:否 制造商:Lattice 系列: 存儲(chǔ)類型:EEPROM 大電池?cái)?shù)量:128 最大工作頻率:333 MHz 延遲時(shí)間:2.7 ns 可編程輸入/輸出端數(shù)量:64 工作電源電壓:3.3 V 最大工作溫度:+ 90 C 最小工作溫度:0 C 封裝 / 箱體:TQFP-100
PSD4-36 制造商:Tamura Corporation of America 功能描述:
PSD-45 制造商:MEANWELL 制造商全稱:Mean Well Enterprises Co., Ltd. 功能描述:45W DC-DC Single Output Switching Power Supply